Part of the Yanmar Operator Manuals.
The moment a 6LPA cranks and dies after a fuel filter change, the fix is a bleed procedure, not a forum thread. Yanmar publication 0A6LP-G00103 is the factory operator manual for the 6LPA-STP2 and 6LPA-STZP2 marine diesels, 106 pages of Yanmar's own procedures, including that bleeding job down to backing the air bleed screw out two to three turns.
Inside are the daily checks and fluid specs (diesel fuel, API CD engine oil in 10W30 or 15W40, marine drive oil, coolant), starting and operation including low temperature starts, the periodic maintenance schedule with torque figures, a troubleshooting chart, long-term storage and recommissioning, and the full piping and wiring diagrams.
It downloads as a searchable, bookmarked PDF, so the numbers go wherever the engine is: a tablet at the helm, a phone at the mooring, or a printed page beside the filter housing. With the impeller out and the filters off, the intervals and torque figures are already at hand.
What's Inside This Yanmar 6LPA-STP2, 6LPA-STZP2 Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| English | 1-2 | - |
| Introduction | 7-8 | Record of Ownership |
| Safety | 9-14 | Safety Precautions (Before You Operate, During Operation and Maintenance), Location of Safety Decals |
| Product Overview | 15-30 | Yanmar 6LPA Series Features and Applications (New Engine Break-In), Component Identification (Service Side, Left Side As Viewed From Propeller, Non-Service Side), Nameplates |
| Before You Operate | 31-42 | Safety Precautions, Diesel Fuel, Engine Oil, Marine Drive Oil, Engine Coolant |
| Engine Operation | 43-54 | Safety Precautions, Starting the Engine (If the Engine Fails to Start, Starting at Low Temperatures, After the Engine Has Started) |
| Periodic Maintenance | 55-74 | Safety Precautions |
| Troubleshooting | 75-78 | Safety Precautions, Troubleshooting After Starting, Troubleshooting Information, Troubleshooting Chart |
| Long-Term Storage | 79-82 | Prepare Engine for Long-Term Storage, Drain Seawater Cooling System, Returning the Engine to Service |
| Specifications | 83-86 | Principal Engine Specifications, Marine Drive Specifications |
| System Diagrams | 87-100 | Piping Diagrams, Wiring Diagrams |
| Warranty Service | 101 | - |
| Rcd | 102-106 | - |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Fuel filter replacement interval | Initial 50 hours, then every 250 hours or 1 year whichever comes first | p. 60 |
| Fuel filter tightening torque | 14.7 - 19.6 N·m (130.1 - 173.5 in.-lb) | p. 65 |
| Seawater pump impeller replacement interval | Every 1000 hours or 4 years whichever comes first | p. 73 |
| Engine oil API Service Category | CD or higher | p. 36 |
| Engine oil SAE Viscosity | 10W30, 15W40 | p. 36 |
| Air cleaner cleaning interval | Every 250 hours or 1 year whichever comes first | p. 61 |
Yanmar 6LPA-STP2, 6LPA-STZP2 Common Problems This Manual Covers
Engine dies after fuel filter service
Air trapped in the low-pressure fuel side is the usual culprit when the engine cranks but will not fire after a filter change. The manual's bleeding procedure has you back the air bleed screw out two to three turns and work the system until fuel runs free of bubbles.
Manual Section: Before You Operate p. 31Overheating from a worn impeller
Impeller blades crack and nick with age, and seawater flow drops before any alarm sounds. Yanmar calls for replacement every 1000 hours or 4 years, whichever comes first, and lists inspection criteria for the blades and wear plate.
Manual Section: Periodic Maintenance p. 55Hard starting in cold weather
A 6LPA that fires instantly in summer can balk on a cold morning. The Engine Operation section covers starting at low temperatures and gives a checklist for what to do if the engine fails to start at all.
Manual Section: Engine Operation p. 43White smoke and sudden overspeed
Engine oil reaching the combustion chamber can push the engine past governed speed with white exhaust smoke, and it will not stop on the key. The troubleshooting chart works from symptom to likely cause so you can shut down safely and find the fault.
Manual Section: Troubleshooting p. 75Belt slip and weak charging
A loose alternator V-belt shows up as a squeal under load and a battery that never quite recovers. The manual gives the deflection check, 8 to 10 mm, for both the alternator and power steering oil pump belts.
Manual Section: Periodic Maintenance p. 55Corrosion after winter lay-up
Seawater left in the cooling circuit over a lay-up attacks the system from the inside. The Long-Term Storage section covers draining the seawater cooling system, preparing the engine for storage, and returning it to service in spring.
Manual Section: Long-Term Storage p. 79Instrument panel and sender faults
Chasing a dead gauge or an intermittent alarm without a schematic is guesswork. The System Diagrams section holds the wiring and piping diagrams so you can trace circuits and lines connection by connection.
Manual Section: System Diagrams p. 87Frequently Asked Questions
Which engine models does this manual cover?
Both Yanmar 6LPA series marine diesels, the 6LPA-STP2 and the 6LPA-STZP2. The Product Overview section identifies components from every side of the engine, and the Specifications section lists engine and marine drive data for each model, including the weights that differ between the two. p. 15
Is this an operator manual or a full workshop manual?
It is the factory operator manual, Yanmar publication 0A6LP-G00103. It covers operation, fluids, periodic maintenance with intervals and torque figures, troubleshooting, storage, and system diagrams. It is not a rebuild manual, so internal disassembly and bearing clearances are not included.
Does it list oil and coolant capacities?
Yes. Total engine oil capacity is 10.5 L (11.0 qt) and engine coolant capacity is 13.5 L (14.3 qt), both in the Specifications section alongside the 232 kW (315 hp) output rating, low idle speed, and recommended battery capacity. p. 83
Are filter and impeller service intervals included?
Yes. The Periodic Maintenance section schedules fuel filter changes every 250 hours or 1 year after the initial 50 hour service, and seawater pump impeller replacement every 1000 hours or 4 years, whichever comes first. It also lists the fuel filter element part number, 119773-55710. p. 55
How will I receive this Yanmar 6LPA-STP2 Operator Manual?
This is a 106-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Am I able to print pages from this manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
Is the electrical system covered in this Yanmar 6LPA-STP2 Operator Manual?
A wiring diagram for the Yanmar 6LPA-STP2, 6LPA-STZP2 electrical system is included.
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